Improvement in step-ladders



l. BLAUVELT. .Step-Ladder.

-N().163,041.4l Patented May 11,1875.

'I MTM Y mijn ATTUBNEYS.

'NITED STATES PATENT OFFICE.

JAOOB BLAUVELT, OF'BLAUVELTVILLE, NEW YORK.

IMPROVEMENT IN STEP-LADDERS.

Specification forming part of Letters Patent No. 163,044, dated May 11,1875; application filed October 17, 1874.

To all whom fit may concern.:

Be it known that I, JACOB BLAUVELT, of Blauveltville, in the county ofRockland and State of New York, have invented a new and ImprovedStep-Ladder, of which the following is a specification: p

My invention consists ot connecting or jointing plates or hinges forjoin ting the ladder and the braces together at the top, so contrivedthat they will lock when the braces are adjusted to hold the ladder inthe position for usc, and also allow the braces to fold up to the ladderfor storing away, and will lock them in that position, and it alsoconsists of the plates contrived to allow the braces to swing up intoline with the latter, or nearly, and lock them in that position, so asto utilize them for an extension-ladder, the braces being suitablyprovided with rungs or steps.

Figure 1 is a side elevation of a pair of jointplates, showing thepositions when arranged to support the ladder in position for use. Fig.2 is a side elevation, showing the positions when the braces and ladderare folded together. Fig. 3 is a side elevation, showing the bracesadjusted to form an extension of the ladder. Fig. 4 is a section of oneof the plates.

low the an gular-headed pivot to be introduced and removed, also to beturned to the different positions and locked. The large curved portion Hof the hole is to allow of introducing and removing the headed pivot,and also turning it around. The upper angular notch I receives the pivotwhen the braces are to be adjusted to hold the ladder in the positionfor use, as represented in Fig. 1. The pivot be ing introduced throughthe part H of the hole, while the brace is"held at an angle of a littlemore than ninety degrees, moves readily up into notch I as the brace isswung down from said angle to the position represented in Fig. l. TheVnotch J receives the lower end of the pivot when the brace folds down bythe side of the standard A, the notch K allowing it to swing into saidnotch, and the notch J being so that the pivot is held by the lower walla and the wall b of notch K so as to prevent it from working into thelarge part H and escaping from the plate. By shifting the pivot upwardin notch K and out of notch J, and then turning it around to the left inhole H, the upper part of the pivotv will drop into notch L, asrepresented in Fig. 3, and thus hold the braces upward to serve as anextension of the ladder. The little notch M receives one corner of thepivot when moving up from the hole H into the notch I to allow the loweredge to pass point d. The plate O has a socket formed by plates NO P,and a top plate cast on it to facilitate the fastening of the brace toit.

Having thus described my invention, I claim `as new and desire to secureby Letters Patentl The plate A, having notched liolc H, notches I, J, K,and L, in combination with plate O, having theangular-headed pivot E,substantially as specilied.

JACOB BLAUVELT.

Witnesses:

HENRY J. BLAUVELT, FRANK HENION.

